is it possible to delete all appearances from assembly in one klick?
I do not know if it is possible in one click, but in three click it is possible. Select 1st, SHIFT, select last, DELETE
I also thought so, but it is not. Does not work.
You are right. I tried it again with a large assembly with sub-assemby , and there it did not work. Sorry.
As far as I can see, the shortest way is just to right-click on them one at a time and choose "Remove appearance" from the drop-down. Someone could probably write a macro to do that for you. If you move this Discussion to the API section the people who do that kind of thing would be more likely to see it. Don't start a new Discussion, just click on "Move" in the Actions section at top right.
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