Hello there, liketabasco.

I understand how you want to put back the Billable by default checkbox on the employee's profile. While this option is no longer on the payroll settings, there's still a way to keep the Billable checkbox on.

You'll have to do it through the Company settings. Let me walk you through the steps.

1. Click Settings ⚙, then select Account and settings.
2. Go to the Expenses tab.
3. From the Bills and expenses section, click Edit ✎.
4. Turn on Make expenses and items billable.
   
5. Bill payment terms.
6. Click Save, then Done.

Once done, open the Weekly timesheet or Single time activity to see the results. I'm adding these articles to help you enter timesheets in QuickBooks. If you QuickBooks to stop from marking the Billable box automatically, simply toggle it off.

On the other hand, I suggest sending feedback about bringing the button back on the employee's profile. Here are the steps you can follow.

1. Click the Gear icon at the top, then Feedback.
2. Enter your comments or product suggestions. 
3. Select Next to submit feedback.

Your valuable feedback goes to our Product Development team to help improve your experience in QuickBooks. You can track feature requests through the QuickBooks Online Feature Requests website.

Thank you very much for your time. I look forward to working with you in the future. Have a great day!