Hey Jonas,
My suggestion is to use a macro here. Run one to hide and one to unhide.
Code:
Sub HideSheet()
Sheets("ENTER SHEET NAME HERE").Visible = False
End Sub
Code:
Sub UnhideSheet()
Sheets("ENTER SHEET NAME HERE").Visible = True
End Sub
For each sheet you want to hide, make another line.
For example:
Code:
Sub HideSheet()
Sheets("Data").Visible = False
Sheets("Projects").Visible = False
Sheets("Conclusion").Visible = False
End Sub
This would hide the 3 sheets named "Data", "Projects", and "Conclusion".
Let me know if this works and/or if you need more assistance!
Edit: This works best if it's the SAME 40 that you have to hide and unhide daily, which is how it seems to be in this case.