The Gantt view now offers two distinct operating modes.

• The “display of details on a single click” mode, which is the historical mode of ProjeQtOr.

In this mode, simply clicking on a row in the table allows you to show its detail.

• The "display on double click" mode, which is a new mode introduced in V11.0.

In this mode, simply clicking on a line puts the line into edit mode.
You must double-click on the line to display the detail.
This is the new default mode.

If you want to return to the old operating mode, change the setting in the dedicated pop-up via the icon  

.
You can also just right-click on the line for the context menu.