several boxes disappear

What do you mean ?

I thought it might be because of the general frequency of cron

There is no "box eating" process.
(or possibly it was a "lunch box")

where it's coming from

I think it a trick from the soviet lunchbox eater.

Or is it another parameter that needs to be changed?

Reduce the "box eating rate"...
Look for boxEatingRate in the code 👿

if it's because of the overall cron frequency

See above.

how do you get a live refresh?

Take a cold shower ?

Hello Babynus, I didn't understand your answer very well and I think you didn't understand my problem very well, but that's all right, I'll try to explain it to you more clearly. I have created a dashboard that displays the hours clocked by employees and the hours not clocked by employees. This data is displayed in boxes. This dashboard retrieves data from a database which itself retrieves data from Projeqtor. When I run this dashboard, everything works fine but 10 minutes after running it, the boxes displaying the score of each employee disappear. Is this due to the fact that the general frequency of the cron is equal to 10 minutes or not? What value can I set for the refresh to be permanent? Or do I have to declare a refresh in my dashboard?
Yours sincerely. Nathan DEMANUEL.

Is this due to the fact that the general frequency of the cron is equal to 10 minutes or not?

Sure not from ProjeQtOr CRON, because Projeqtor CRON frequency is 10 seconds.
But possibly it come from your ETL process from ProjeQtOr data to your dashbord DB.

[Edit] If your disepearing boxes are BI "cubes", then sure your issue is from your ETL process.

Ok thanks you for your help.
Sincerely. Nathan DEMANUEL.