[Noob] Problem exporting a file (wrong resolution)

Hello everybody,

I have to edit a video, just a copuple of things, the problem comes when i try to export the file. The original file is an screen recording (944x528) and its about 300 mb. When i try to export the file i end up with a diferent resolution and with a huge file compared with the original (about 4 gb). Im quite new with premiere so i dont know what i should do to keep the exact same resolution and size of the original file. Ive tried different options of quality and i aso tried to use the option that comes up when u are exporting a file that says something like "keep the original charatheristics of the file", ive also tried to personalize the size and the format of the file when exporting but its always the same, wrobng resolution and a too big file compared with the original.

Thank you very much!!