I would like meetings to also be hidden inside their projects when I click the minus sign.

this is the basic configuration. I do not reproduce this error.
I only see the fact that these meetings are not in the right project...

I only see the fact that these meetings are not in the right project...
 

Thanks for your answer, not sure to understand what you mean with "the fact that these meetings are not in the right project." : is this an hypothesis or something you deduced from the screen grab ?
From the WBS codes in the example, the meetings (20.2.11.x) are inside the project "Patella" (20).
I have attached two other screenshots which give more details on the hierarchy between the main project (Patella) down to the meetings.

Maybe something is wrong in  our WBS structure ?
But I would like to insist that prior to V9.5.4 we were using V9.4.3 and had no problem displayng the Gantt reduced to the main projects, with no meetings visible : please see the third grab PqtorHiddenMeetingsV9.4.3.PNG 

Check consistency on Administration screen, and apply fix if some isses exist.
You may have WSB unconsistency.

Thank you for the suggestion.
I have performed the Consistency Check "look for errors" from the Administration page.
The answer for WBS sequence control was "no anomaly detected".
So the problem of displaying meetings on the Gantt chart even when the enclosing projects are folded-up does not seem to be related with inconsistency in the WBS codes.

Any other suggestion ?
Could it be related with the depth of the WBS codes  ?
The meetings have long WBS codes, because they generally are the fourth or fifth level of the WBD tree : for example 20.2.11.1 = fourth level of the WBS structure. 

New finding on the display of Meetings in the Gantt views

The display of Meetings in the Gantt view "by ressource" works correctly with the folding/unfolding of the enclosing project. When the project is folded (by clicking on the minus sign), the meetings are hidden , when the project is unfolded the meetings are visible. See examples on the attached grabs.
The same thing still does not work on the "standard" Gantt view
.

Hi,

First, as long as I can see, these are not just meetings, but elementary mettings part of a Periodic Meeting...
This may be important for analysis.
In fact, display of meetings is weird even when project is "open". 
The meetings should be displayed "under" their parent, the preiodic meeting.
It may not be due to depth, as 2 levels is not really deep.

After Consistency Check, do you apply fix ?
It seems there are some errors that could be fixed.
Possibly there are also other errors that could be fixed by concistency check.
Please apply fix and check if issue still exists.

Hi,

First, as long as I can see, these are not just meetings, but elementary mettings part of a Periodic Meeting...
This may be important for analysis.
In fact, display of meetings is weird even when project is "open". 
The meetings should be displayed "under" their parent, the preiodic meeting.
It may not be due to depth, as 2 levels is not really deep.

After Consistency Check, do you apply fix ?
It seems there are some errors that could be fixed.
Possibly there are also other errors that could be fixed by concistency check.
Please apply fix and check if issue still exists.

Hi ,
my answers are directly in your post below. Thank you for your help.

First, as long as I can see, these are not just meetings, but elementary mettings part of a Periodic Meeting...
This may be important for analysis.
Yes, you are right, most of the meetings in our planning were declared as instances of periodic meetings.
We also have the same display issue (incorrect indentation and not disappearing when the parent is folded-up) on a few other activities that are not meetings.  But the majority of the activities display correctly.

In fact, display of meetings is weird even when project is "open". 
The meetings should be displayed "under" their parent, the preiodic meeting.
It may not be due to depth, as 2 levels is not really deep.
Yes, we also noticed that the positions of the meeting instance relative to their parent (the periodic meeting declaration) was strange but we don't know what caused that. It was correct before switching to the latest version of Projeqtor.

After Consistency Check, do you apply fix ?
It seems there are some errors that could be fixed.
Possibly there are also other errors that could be fixed by concistency check.
Please apply fix and check if issue still exists.
Applying the fix resulted in a mysterious error message : ERROR : Une erreur est survenue le 2022-06-13 à 10:05:26
Please see attached grab.  

The issue on meetings display remains the same after applying the fix.

Please post error logged in projeqtor log file at 10:05:26

Log file of this morning :

2022-06-13 09:46:15.026 ===== TRACE ===== NEW CONNECTED USER 'jcreton'
2022-06-13 10:01:19.772 ** ERROR ** [V9.5.4] ERROR **
2022-06-13 10:01:19.772 ** ERROR ** [V9.5.4] on file '/var/www/html/projeqtor/model/Consistency.php' at line (494)
2022-06-13 10:01:19.772 ** ERROR ** [V9.5.4] cause = Undefined variable $critArray
2022-06-13 10:05:26.115 ** ERROR ** [V9.5.4] ERROR **
2022-06-13 10:05:26.115 ** ERROR ** [V9.5.4] on file '/var/www/html/projeqtor/model/Consistency.php' at line (494)
2022-06-13 10:05:26.115 ** ERROR ** [V9.5.4] cause = Undefined variable $critArray
2022-06-13 10:36:29.927 ** ERROR ** [V9.5.4] ERROR **
2022-06-13 10:36:29.927 ** ERROR ** [V9.5.4] on file '/var/www/html/projeqtor/external/pChart2/class/pDraw.class.php' at line (1243)
2022-06-13 10:36:29.927 ** ERROR ***** [V9.5.4] cause = Implicit conversion from float 10.000000017948967 to int loses precisio

Hi,

We'll fix this issue on V9.5.5.
As it deals with consitency of meetings, it may solve your issue...

OK lets wait for V9.5.5 then!
Thank you

This issue (display of meetings even when parents project are folded) disappeared after installation of Projeqtor version 10.0.3 : solved