I hope my little opinion will help improve!
The first thing that comes to mind is the name change of each tab. Like the repeater of the burpsuite.
Change tab name
<ZAP Requester >
< Burpsutie Repeater >
Tab or Window
Second, I wonder if the Requester can be opened with a window instead of a zap dependent tab. I also use Manual Request Editor as a full screen, and I think it would be good if it was possible in Requestor.
It is currently available in the Manual Request Editor, but not in the Requester. This is the biggest reason why I use Manual Request Editor.
P.S
Also, 'show line numbers', 'show newline/whitespace char', and other functions are hidden, so I think there will be a lot of people who don't know. I think it would be good to increase accessibility.