How to groupand ungroup the model

You cannot ungroup a separately finished product. For a finished product consisting of multiple objects, you can perform the following steps:

Group action: Hold Ctrl, left-click on the items you want to group with the mouse cursor. After selecting, press Ctrl + G.

Ungroup action: Left-click on the grouped items and press Ctrl + B to ungroup them. (Before ungrouping, you need to check if the item is grouped. Only when a large white frame/blue frame is displayed is the item considered grouped. Only grouped items can be ungrouped.)