Both the Default PCB and Default Schematic use the same Worksheet.
The worksheet that will be used for both gets declared in the .kicad_pro file.
It’s declared in a single descr line for the PCB.
If you want to use different Worksheets for the PCB and Schematic, you can declare the one for the Schematic in the .kicad_pro file. [edit the file, it’s a text file]
Of course, it makes sense to make a Template and to do the above for the .kicad_pro file in the Template.
Doing it this way enables you to have different or similar Worksheet graphics, layout and notes/comments (they will retain what you define in the usual manner using the Settings for Paper size icon in PCB/Schematic.
That is how I do it - my comments for PCB are different than comments for Schematic.
Example for PCB and Schematic worksheets and the descr string in the .kicad_pro file.
