Steps to reproduce:

1. Go to page builder

2. Open timeline and move preview to the future

3. Look at Elements sidebar

Current behaviour:

Even though blocks aren't draggable (which is correct behaviour) styles of these blocks aren't changed, they simply lose event on drag

Expected behaviour:

Items in toolbox should be disabled in " preview" mode

Styles: https://projects.invisionapp.com/d/main?origin=v7#/console/21342437/459679221/preview?scrollOffset=6224