@leocg
Thanks for the reply. I tried deleting cookies and deleting site data but it didn't work. Maybe it's not compatible with the Pixel 8a?

@hitomisasaki
The smartphone I use is Google Pixel 8a.
There were no problems with the Google Pixel 5 I used before.

@leocg
Thank you for your reply.
I have already checked by clicking the three dots on the top right corner and disabling desktop mode for the page.
The site is still displaying in desktop mode.
What can I do?

I'm having trouble with the Opera web browser app for my Android smartphone. Even though I'm not in desktop mode, certain sites are displayed in desktop format. How do I switch the display to smartphone site mode?

In Appearance → Accessibility → Default site layout (user agent) is set to "Mobile version."

AndroidスマートフォンのWEBブラウザアプリ「Opera」で、困っています。デスクトップモードにしていないのに、特定のサイトでデスクトップの形式で表示されます。スマホサイトモードに表示切替する方法を教えてください。

「外観」→「ユーザー補助」→「デフォルトのサイトレイアウト(user agent)」は「モバイル版」になっています。