how do you even what ? you mean make it even ? what do you mean by that ? what are we looking at right now ? what is not even? how long is a bit of rope ? what does the line tool has to do here ? if you want to straighten something, you need the rotate tool. if you need to delete something you can use the eraser. then again I’m not sure what you’re trying to do…
help us help you.
have you checked the video ressources the other have provided ? have you followed the courses step by step (not on your specific 3d model but following exactly what the videos describe? )
you’ll have to show us what you mean there too.
is it just a single panel from your screen that is now in the middle of your screen ? or the whole tray ?
single panel, simply drag it back to the tray.
whole tray, drag it to the middle of your screen, you’ll see four symbols allowing you to reattach it to a border of your screen.
pretty sure the interface management is covered in the videos Aaron recommended.
sketchup might be one of the easiest 3d software to get into. but it’s still a pro software (so not alsways easy). and it’s still a 3d software (also not simple). we can do tech support but we’ll need a bit more infos…
in order to maintain faces, sketchup will triangulate non flat surfaces. if it creates lines, it’s so your model keep its faces.
pretty sure it’s explained here
https://learn.sketchup.com/courses/sketchup-fundamentals-part-1
here is a small animation by Box from 5 years ago (a quick search gave it as a result) explaining the issue.
really, it sounds like you started a specific project head on and now you’re getting stuck on small things. it’s a software. it’s like learning a language. you need to understand the grammar and the basic structure in order to actually learn the language.
it takes a bit of time and practice but it’s worth it.