Request a new feature, or support for a camera/lens that you would like to use in Capture One.
When working on midtones or white portions, cursor tools such as heal, clone, straighten etc. become almost or totally invisible.
It would be good to have an option to change the cursor tools to black because this would put less strain on the eyes.
Ideally, the tools could sense the tone of the layer being worked on and automatically adjust for good visibility.
I don't know of any workaround. It strains my eyes.