The Zoom meeting app appears to be a larger resolution than the desktop. I've apt remove --purge, deleting any configuration files I could find using the find command, removing and reinstalling, installing from the deb file from Zoom, and installing from flathub. I had larger fonts set in the Settings of eOS and switched to the Default setting. The problems seems to have occurred after this, but I'm not 100% on that. I've attached a screenshot. Thanks.
Open terminal to remove zoom. Type:
sudo apt-get remove --purge zoom
Download the package for Ubuntu (64 bit, version 14.04+) from here: https://zoom.us/download?os=linux
cd cd Downloads sudo apt install -y libglib2.0-0 libxcb-shape0 libxcb-shm0 libxcb-xfixes0 libxcb-randr0 libxcb-image0 libfontconfig1 libgl1-mesa-glx libxi6 libsm6 libxrender1 libpulse0 libxcomposite1 libxslt1.1 libsqlite3-0 libxcb-keysyms1 libxcb-xtest0 libegl1-mesa libxcb-xtest0 sudo dpkg -i zoom_amd64.deb
Wait when it will finish installation without errors. It takes even up to 5 minutes.
I have a normal resolution after I installed it correctly.