Before submitting your timesheet you will have to stop your running timer and make sure all logs have projects assigned. Otherwise, you will see this error message when trying to submit:

The weekly Track view does not show time logs without projects or with running timers.

To edit such logs, you need to navigate to the daily Track view:

If you have a running timer, you can stop it with the Stop button on top of the page (or on the running log):

Time logs with no projects assigned may be missing all data or have only notes/descriptions. You need to click on the time log to open the edit form and assign a project to it.
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Here are the examples of how different logs will look like:

Once you assign a project to all your logs, you will be able to submit your timesheet. To submit the timesheet, you need to navigate back to the weekly Track view.