To reset the SD card using UP Studio you will need to select the settings icon in the top right corner of the software which will bring you to a small menu.

Once here click on printer and you should see your printer, select it. There should be a icon that appears on the top left with 3 lines.

This menu will show the Printer Properties, at the bottom on this menu you can use the "Reset To Default" to reset the SD card to default.

NOTE: Doing this will reset the nozzle height and platform leveling settings as will as the material settings, please ensure that you have checked these things before printing again.