Select the images you want to hide, then press the 3-dot Options icon in the top vertical menu.
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In the list, click on Hidden. An Update Images box will pop up. Click on the Yes, Update Them button.
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Once the images are hidden, they will appear grayed out or have low opacity.

To make your hidden images visible again, select the hidden images you want to make visible again.
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Go to the 3-dot Options icon and click on Visible in the list.
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Once the Update Images box pops up, click on Yes, Update Them. Your selected images should now appear as normal.