This morning it came up with no cursor at all. It was perfectly fine until about 4AM today when I've turned off my computer. Hoping it's this very moment I'm 'tabbing' through the browser because my mouse is unavailable. If the problem comes back, I'll reply here.
Running on a Surface Laptop 3 at default res (2256x1504) at recommended scale (150%) So.not sure if the latest Edge build just fixed it, or if it had something to do with Google Chrome being installed, or both actions combined ? I can repeatedly close/open with touch without problems. Since that point, the touch issue is gone. (It frequently auto updates, so I don't think I've ever too far behind the latest version.) I clicked the update button in Edge, bringing me to version Version 84.0.522.9 (Official build) dev (64-bit).
I went into the About settings page in Edge and noticed an updated was available. Re-opened Google Chrome and still no problem there. I closed Chrome and switched over to Edge (Dev channel), and closed the browser by touch, and the cursor disappeared as soon as I opened it again. I installed Chrome, and Chrome didn't have any issues with the cursor disappearing.
I'm hesitant to say it is fixed, but I can't reproduce as of just a minute ago after having installed Google Chrome to test what you asked about.
