Before configuring these widgets, right-click the desktop, go to "Desktop and Wallpaper", and under "Layout", select "Desktop ...
You can easily change the clock style that is being used by your Samsung Galaxy Z Flip 3. You can also set the always on display so that the clock widget will always be displayed on the cover screen.
To make my second screen useful, I stopped trying to treat it like a second workspace and started using it as a dashboard ...