Open the Google Sheets file
Click the sheet tab you want to lock
Right-click the sheet tab
Select Protect sheet
In the sidebar, click Set permissions
Choose who can edit the sheet
Select Only you or Custom
Click Done
Open the Google Sheets file
Click the sheet tab you want to lock
Right-click the sheet tab
Select Protect sheet
In the sidebar, click Set permissions
Choose who can edit the sheet
Select Only you or Custom
Click Done