Add the following (blank) keybinds to Settings > Controls
Go to Hotbar #1
Go to Hotbar #2
Go to Hotbar #3
Go to Hotbar #4
Go to Hotbar #5
Go to Hotbar #6
Go to Hotbar #7
Go to Hotbar #8
Go to Hotbar #9
Go to Hotbar #0
Go to NEXT hotbar
Go to PREVIOUS hotbar