I have hundreds of annotation scales named like "1:1000_1" in my drawings. How to remove them? It is too tedious to click them one by one.

You can use the command -SCALELISTEDIT to reset annotation scales in a single drawing, or the Scale List Cleanup utility or DBXremSL to perform batch cleaning - see the tip:https://www.cadforum.cz/en/qaID.asp?tip=5871

Thanks, I was able to get rid of them.