Red marker cross on canvas can't be hidden or deleted

Question

I've somehow created an indelible red X on my map in QGIS. I can't select it, and switching off all the layers doesn't hide it. It doesn't show in the print layout. Its a constant screen size, eg mm.
Is it some feature I accidentally switched on?
How do I get rid of it?
Running 3.14.6 on W10

HeikkiVesanto · Answer

That is from a layer being edited.
You may have accidentally deleted the layer with the edit still on progress.
Restarting QGIS will resolve it.

JGH · Answer

This red cross comes from the Vertex Tool on a point layer: select a point, move the mouse without clicking on the map, then stop editing -> the red cross remains.
To remove it, you can start editing the layer, use the Vertex Tool again and right click anywhere to dismiss the last not-terminated move.
If you don't know which layer it is, try restarting QGIS (as suggested by @MrXsquared and @HeikkiVesanto).

Red marker cross on canvas can't be hidden or deleted

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