I use ThinkPad X13 Gen 2i When I update to 5.27.80, my touchpad cannot be founded, and my 'tap-to-click' settings has gone Now I cannot use 'tap-to-click' on my touchpad Screenshot: https://ibb.co/NZgj7SN
Are you using the synaptics touchpad driver?
I think YES, as I have synaptics installed on my Windows OS.
Also I want to know if Plasma 6 support tap-to-click by default?
This is a driver issue; please report it to Libinput (https://gitlab.freedesktop.org/libinput/libinput/-/issues/)