THIS IS IT! As soon as I just got the problem to happen again on my end and I was about to restart the editor like I normally do I decided to instead un-fullscreen my windows on my other monitors. As soon as I did this I could right click on things with the drop-down menus coming back without having to restart! At least for me, this seems like an issue with multi-monitor setups having other fullscreen things on them and Unreal Engine. @Orbiter7MD thank you so much for sharing this info.
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