Follow these steps to hide/unhide content for mobile view :

Hide content:

First change the view to mobile Mode. (on the left top bar of the page builder)
Then click on the element which you want to hide with only one click.
On top bar click on "Hide".

Click on publish or update.

Unhide content:

Click on the "Gear Icon" on the top right side of the page.
Then click on the "Manage Content".
Click on the Eye icon (with a line on it) to unhide the content.

Click on publish or update.
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