Hi there, Januaria55. Let me provide more information in editing your journal entry in QuickBooks Online (QBO).

There will be no options after Add lines and Clear all lines apart from Memo and Attachments. However, you can edit your line entries by simply clicking each line.

Here's how:

1. Click the magnifying glass on the top right portion of your QBO account. 
2. Search for the JE you want to edit.
3. Once opened, you can click on the lines you like to edit.
    

There will be no edit button beyond Add lines and Clear all lines. However, you can edit your JE by simply clicking each line.

Here's how to zoom out:

1. Click the three dots on your browser's top right corner.
2. Under Zoom, click the minus icon (-) to zoom out.

I've added a couple of screenshots for your visual reference.

 

In addition, you can visit our article on how to swap the debits and credits or delete your JE: Reverse or delete a journal entry in QuickBooks Online

Feel free to comment if you have any concerns beyond what's mentioned above. I'm always available to assist you.