How to UN-override master page items with InDesign

Question

I just learned with master pages, you can override items by pressing control, shift and left click the item. Or you can use this option on a page:

But how do you selectively prevent items from being override-able after it has been override?

Answer 1

From the Adobe ID help:

To remove master overrides from one or more objects, select objects that were originally master items. In the Pages panel, target a spread and choose Remove Selected Local Overrides in the Pages panel menu.

To remove all master overrides from a spread, in the Pages panel, target the spread (or master spread) from which you want to remove all master overrides. Choose Edit >Deselect All to make sure that no objects are selected. In the Pages panel, choose Remove All Local Overrides in the Pages panel menu.

Note: if you've not over-ridden, but rather detached items, this will not work. If that is the case, you'll have to delete your detached items and re-apply the Master to those spreads.