I don't really understand your question. I only see one set of raid frames in your screenshot (above and to the left of your minimap) and it doesn't look like Grid unless you've already spent a lot of time configuring Grid to look exactly like the oUF-based unit frames built into Mono UI.
If you're asking how you can disable some of the unit frames in Mono UI, then you should probably ask your question on the Mono UI page... but on the Mono UI page it says quite clearly:
Most add-ons are configured through editing lua files and do not have any GUI.
If you don't want to learn HOW TO modify those files - don't use this UI.
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... which, coupled with the fact that none of the slash commands listed there have anything to do with disabling unit frames, leads me to believe that you would need to modify the oUF layout in Mono UI in order to remove its built in raid frames.