Steps to reproduce:

1. Go to Page Builder

2. Hover over each button in header

Expected behaviour:

All buttons have tooltips

Current behaviour:

Not all buttons have tooltips (for example desktop/tablet/mobile switcher)

IMPORTANT

In main branch there are two new features - History and Structure View, which added some buttons that are missing tooltips as well, so it will need extra PR to fix these as well after merging to 4.5