I appreciate you getting back to this thread, @loren-brandenbur. I'll be glad to add some details to help you edit the service type on the time entry details page.

To begin, make sure to turn on the Time tracking feature in the Accounts and Settings. Doing this will add the service field to the Timesheet. 

Here's how:

1. In your QBO account, go to the Gear icon.
2. Choose Accounts and Settings.
3. Select the Advanced tab.
4. Click the Time Tracking section, turn on the Add Service field to Timesheets option.
5. Select Save and Done.
   
   

Then, go back to the Projects menu, and proceed to the following steps for the Service dropdown menu to appear on the Time entry details page.

1. Find and choose the project you want to edit.
2. Choose the Time Activity tab.
3. Open the details of the time entry by selecting the date.
   
   
4. On the Time entry details page, click the Save button.
   
   
5. Now the Service dropdown menu will appear and you will have the option to edit this.
6. Once done, click Save again to keep the changes.
   
   

If the issue persists, we can perform some troubleshooting steps to fix this. There are times that the browser is full of frequently accessed page resources, which causes some errors or unusual responses. Let's start accessing your account using a different or a private browser. 

Once you have successfully edit the service type, go back to your regular browser and clear its cache. This is done to speed up the process next time you do a transaction in QuickBooks Online. Also, an alternative way is to use other compatible browsers.

Additionally, let me add these articles to help you manage projects in QuickBooks Online:

• How to add existing invoices to your project.
• Set up, track, and view your hourly labor costs.

Feel free to leave a comment below if you have other questions about modifying your projects in QuickBooks. I'll be happy to assist you again. Keep safe and take care.