When viewing the equipment grid of a vehicle or item from the map view, you can click on items in the grid to have them removed by bots. They will then show up with a red cross on top of them. However, you seem to be unable to cancel this removal by right-clicking. I would expect a right-click to cancel the removal, like it would similarly cancel the removal of items from building and vehicle inventories.
I've tested this with a deployed tank, and a power armor that was in a chest. I haven't unlocked other vehicles yet.
(Note on edit: the previous version of this post just mentioned tanks. I figured I could also test power armors stored as items in chests, which then also suffered from the same issue, so it seems it's related to equipment grids in general and not just tanks)
