Select the images you want to hide. A blue border will appear around them.

Click on the 3-dot Options icon in the options row above your images. From the drop-down menu options, 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.