Missing split preview icons
After updating pycharm (2021.3.3) I can no longer toggle the preview windows. I have looked everywhere in settings and in every menu to try to re-enable these icons, but I'm unable to find any setting that controls it.
Often programming on a laptop and having only a single monitor, this just doesn't work as I may split the entire screen between pycharm and another application. Now my coding space is less than 1/4 the screen.
How can I re-enable the icons to toggle previews on or off (as well as vertical or horizontal preview)

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To clarify, these are the icons that are missing. Reverting to 2021.2.4 brought them back.
Hello,
My apologies, this is a known bug https://youtrack.jetbrains.com/issue/PY-52224 , please apply the workaround provided.