Welcome to the forum, Tan.
You can quickly disable/enable it.
The fastest way to do it is :
Right-Click main calendar (open context menu) > Calendars > click [your google calendar] to toggle it.
The fastest way to do it is use "Calendar List" window.
Add (activate) "Calendar List" window :
Right-Click main calendar window (open context menu) > Options > Skins > Add "Shadow4 - Calendar List" from the left side - "Available skins", into the right side - "Active skins" > OK.
Then you can easy toggle [your google calendar] is disable or enable.