Hello! I am very new to GDevelop, and I started making a 3d sandbox game, but the collision masks are not working very well. I would like it so that you could just grab an object, and as you were grabbing it, you could also rotate it. currently what is happening is that the mouse just has to hover over the boards to be able to move it, instead of having to grab it. But the biggest problem I am having is that the mouse has to hover above or below the actual board to move and rotate it, instead of directly hovering over it.

To select in 3D I think you’ll need to use a 3D raycast as discussed in this thread:
As for the other issue of needing to “grab”, I assume you mean pressing the mouse button. The “cursor/touch is on object” condition only checks if the cursor is positioned over the object - if you want to require a mouse button at the same time, use the “mouse button held” condition

