A continuous cylinder can't be flattened, can it? If you were holding this part in your hand, how could you unroll it? You will need to create a thin cut from top to bottom. There is a tool called Rip that is meant for this situation.
In addition, you have dimensioned your material in Sketch 1 to be 4 mm thick, but your Thickness parameter is 1 mm. Adjust your sheet metal defaults, or select a different Sheet Metal Rule, so the Thickness parameter is what you want.
As for adjusting the XZ and YZ planes, the short answer is "no". This is like asking to adjust the earth so that the leaning tower of Pisa stands straight-- straight in relation to what? The origin planes are the basis for everything else. You ask about rotating them five degrees-- measured from what?
Attach this new file with the Rip feature here.
Did you get the material thickness set correctly?
You are going about modeling this part all wrong.
It is a sheet metal part - therefore use sheet metal tools (not Extrude, at least not till you are experienced).
Your Sketch1 should be 1 circle and only 1 circle. (either the outside dia or inside dia - whichever one is most important to you)
Then use the Contoured Flange tool to create the sheet metal cylinder.
I suspect your holes are all wrong (and sketches not fully constrained).
I suspect your holes will be drilled/punched in the flat, not the round (it makes a difference).
I have attached my new file with RIP. I tried other options like Unfold and refold, but I want to get the cylinder flat patterned.
Hello. I was able to extrude and flat pattern in my other file which is attached here. But, I am not able to figure out the problem in my 2mm thick cylinder.