Hey there,
since this week we have been experiencing issues with the dropdown function in onlyoffice sheets. Currently dropdown menus don’t appear in cells anymore, when checking the data validation everything is still currect though, so it seems to be a bug. We have different users, using sheets on different devices, both desktop and online versions and in none of the documents the dropdown cells are responsive.
I guess this is a bug. Would be great if it can be follow up.
Thanks a lot,
The same problem has just been reported today by users in my company.
I hope this bug will be fixed soon. We use quite a few files with drop-down lists.
Hello @NetCHP, @angie1 , it seems that the issue that you’d mentioned is the same as discussed within this topic: Drop-down list in the spreadsheet - #3 by Zhniva
Please check and confirm. If it is so, then I’ll close this thread and the further communication concerning the drop-down list issue will be continued there, I’ll update that thread as soon as I have news
I confirm 
Alright, please wait for the relevant news in that thread