In Primavera software, there are many toolbars (as shown in the image below). Sometimes, these toolbars disappear (by accidental clicks) or move around in the software from their original position (by dragging with mouse). Obviously, this is an issue when the toolbar is not there or it has moved from its place.
I explained here how to reset toolbars if you find them lost or moved around.
Now I will explain to you a two-step solution here that will prevent the toolbars to disappear or move from their positions again.
Step 1: Open 'View' menu
Step 2: Click 'Lock All toolbars'
That's it. Now the toolbars will stay where they are.