TL;DR
Change controls inventory option's name "Toggle filter" to "Remove item | Toggle filter" AND/OR change it description.What ?
In settings -> Controls -> Inventory -> Toggle filter. Rename the name of that option to more verbose and obvious "Remove item | Toggle filter" and/or change it's description. Current descriptions says only about filters, and yes it reflects what it does but it is not obvious.Long read
My middle button on the mouse is currently broken. So i had faced with the problem that i couldn't remove items from quickbar, so i went to the controls settings I didn't found any related option (i thought so then). And after several times i checked every option's names, i gave up and found solution in google, which is "Toggle filter".Change that option's name to sort of "Remove Item/Toggle filter" and/or add additional information about removing items from quickbar in option description, because current name is confusing and doesn't reflect the essence of things.
It's also located in an "Inventory" section which is not completely obvious because there is also exists an "quickbar" section.