I have PSE 2018 installed on a MacOs Big Sur 11.2.1, when I try to use tools in DRAW, the pics disappear when I engage any of the 8 tools within that section. When I engage the tool, the pic disappears, when I release the tool, the pic comes back. Therefore, anything I try to do in this section, I end up having to work blindly. The tools work but I cannot see what I am doing. Thanks....Ken
Elements 2018 will not work with Big Sur. I'm afraid you will have to upgrade.
You'll need to upgrade to Adobe Photoshop Elements 2021 as that is the only version of Photoshop Elements that will run on the latest macOS (Big Sur).
At the moment the upgrade price is $80 but if you download the 30-day free trial and keep an eye on Adobe's website you might find there's a new promotion on during those 30 days which might save you a few dollars.