Hi @borzaterjatev ,
you can use this Chrome extension to hide the button : https://chrome.google.com/webstore/detail/trello-clean/iodgmlcdnnjgiejimnifloaaaehkbdno
This is the only way to achieve what you want at the moment.
Let me know if this helps,
If you had to thrive a new habit during a lockdown, what would it be? Trello
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