Glad to have you here in the Community, @ashley33.
At this time, the Billable checkbox in Timesheets will put a checkmark by default if the Time Tracking feature was set up. Your employees can consider unchecking the Billable checkbox manually when entering their hours in Timesheet.
I can see how smooth the process will be if the Billable checkbox is unchecked by default every time your employees will enter their hours. But I want to let you know that your voice matters and I'm submitting feedback directly to our product engineers for consideration.
For now, you can visit our blog site so you'll be able to get the latest news about QuickBooks and what our Product Care Team is working on.
You might want to read this article to know more about time tracking: Set up time tracking.
Please keep in touch if there's anything else I can do to help you succeed with QuickBooks. I've got your back. Have a great day.
