@radius688 Hi,
there are a few things to do: set the Viewport Shading (the dropdown menu at the top right of the Viewport) to Vertex.
Make sure that on the Canvas under Output the Paintmap Layer is not red; if it is, click the + next to it.
You can give the Canvas an Initial Color, otherwise (if it’s set to None) it will paint on a black Canvas.
And play around with the Effects and so on…

If you select the Brush, you can also change the Paint Color (default is blue).