RStudio just released a preview release (1.4.869) that makes the Visual Editor useable.
The cursor is visible when it's within a code block and rscodeio theme is applied, but not when it is in the markdown sections, as shown in the below screenshot. My cursor is in the second line of text, but you can't tell unless you start typing.
Other themes the cursor is shown properly.
Pop!OS 20.04, R 4.0.0, latest pull of rscodeio, and RStudio 1.4.869
