LustreRentals

I am a little bit new to making a website on square space. I have been trying to find this on google / youtube / forums for hours and I just cannot figure it out. I don't like the way my overlay menu looks and the settings on squarespace aren't helping much. My website is lustrerentals.com , I don't like the way my overlay menu takes the whole screen. In the next picture it is another square space website tremontrentals.com , i like how their overlay menu on mobile only takes up half of the page. Any help on how I can make my mobile overlay menu look like the one on tremontrentals.com would be appreciated!

@tuanphan Hello mate, do you think you can help me with this same issue on my website? https://www.lustrerentals.com/ It would be much appreciated I have been trying to figure this out for a long time!