On every sheet that has comments in it, Google Sheets shows the total number of comments in a green box in the tab at the bottom of the screen:
Is there any way to hide it?
Google Sheets – How to Hide the Comments Counter in a Tab
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I've searched the net and wasn't able to find a solution for you. As per this answer on SO, it's also not possible to do it via Google Apps Script.
Copying from a template, having no gridlines, is just as quick as deselecting the gridlines.
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Best Answer
From my knowledge, there is no way to hide this comment counter. However, be aware the flag will only count open comments and not total comments on the tab. This means if you resolve open comments in the Sheet, you will notice the counter going down and eventually disappearing when there are no more comments left.
You can see all comments on a sheet by right-clicking on the tab and selecting "View Comments". You can also cycle through all comments on the sheet/tab by using Ctrl + ALT + N to go to the next comment, or Ctrl + ALT + P to go the the previous comment. Finally, you can navigate through the comments via Comment History.
This way you should be able to eventually find and resolve all open comments as a workaround to get rid of the counter.