Not sure why you would need to see the other buttons while hovering over a specific one, but you can either increase tooltip background transparency or increase the hotbar tooltip delay in options (Alt-O).
Otherwise you can also edit the tooltip page and set a minimum height to the window, causing it to appear high above your hotbars (if you have them at the bottom). You will have to set background transparency to 0 in the options and add a custom background (if you need it).
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