I would like to suggest users are able to use CTRL+MOUSE Scroll up/down to zoom in and out of the board. If you use Microsoft Teams, you can do that. This because we have a few screen of different size. Some portable monitors are UHD and smaller in physical size. When we move the desktop app to this screen, we want to be able to instantly adjust the size of the text (zoom in, zoom out) .
Zoom out: fonts become smaller and can see more columns on screen
Zoom in: fonts become bigger and view lesser, useful for smaller screen sometimes.