Employees submit a form, but approval flow defaults 'Created by' field to me and not the employees

mym3652500 the Created By column will always use the name of the owner of the flow, so you need to create another column to hold the details of who submitted it the form. I normally use the Title column for this but you could create a different column if you need the Title column for other information. I also usually use the Office 365 users Get user profile action to hold the responder's email address because then you can use other information like the display name or their firstname in other actions, for example we send a personalised email back to responder with "Hi Rob, thank you.....".

The same applies for the approval, you'll need to use the column where you are storing the user's email address, not the Created by column.

Rob
Los Gallardos
Microsoft Power Automate Community Super User