Issue #781 has been resolved with this PR.

Hey @kan6868
Now I've realized that your implementation works, but only in a desktop browser. I tested it on a mobile device, and the result is not as expected. I'm sharing a screenshot from my phone: the red circle is positioned (in the code) at the center of the screen, but on the mobile device, its actual X position appears right at the right edge. In a desktop browser it displays correctly, but on mobile it always shows up at the edge.

As an additional note, I'm using the latest version of Solar2D (2025.3718) with 'zoomEven' as the scaling mode.

Game test:

Hey @kan6868 Now I've realized that your implementation works, but only in a desktop browser. I tested it on a mobile device, and the result is not as expected. I'm sharing a screenshot from my phone: the red circle is positioned (in the code) at the center of the screen, but on the mobile device, its actual X position appears right at the right edge. In a desktop browser it displays correctly, but on mobile it always shows up at the edge.

As an additional note, I'm using the latest version of Solar2D (2025.3718) with 'zoomEven' as the scaling mode.

Game test:

issue.mp4

It's work fine with my project.
https://woodsword.itch.io/keepsantaalive
pass : 111111

My config:

Window build settings:

https://woodsword.itch.io/test
pass: 111111
Test with Match 3 Space RPG Demo with some changes

Make sure you display game in Landscape orientation.

Ok, it looks like it's not working with portrait.
Hopefully, I'll have some time this weekend or next. There are a few other strange behaviors in the HTML that I want to examine.

Hi @kan6868 ,
Would it help if I told you that everything works perfectly in build 2024.3709? With zoomEven, everything displays just fine on both PC and mobile (whether in portrait or landscape mode), though the downside is that the graphics appear blurry—unlike how they look now.

I'm sharing a link to one of my games (set to "portrait", with defaultMode = "maximized" and scale = "zoomEven"), created with build 2024.3709, so you can test it on your PC and phone and see the difference. On mobile, the issue where the canvas isn't fully visible doesn't happen, and both this and all my games are designed to adapt to the screen size, whether in portrait or landscape.

Game link:
https://resplendent-heliotrope-f5e296.netlify.app/