I do also have a problem with the trackpad after installing Big Sur. For the most time my trackpad (Macbook Pro 13" 2020) works fine, but clicking stops working in the open file modal. It's very frustrating.
AndreasHeintze
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I've also had this problem since installing Big Sur, it's very annoying. Often it's buttons in the control panel that's not working or in the open file modal. Please fix this soon!