when I try to open b.ino at the same time, the opened file and content are still from a.ino, instead of b.ino.
Is there a way to open different .ino projects separately in Arduino IDE 2.3.5 without this issue?
Thank you!
I believe that was one of the problems reported with 2.3.5 when it was released, but according to the linked post, it was fixed prior to the release of 2.3.6:
Its probably worth downloading and upgrading to 2.3.6.
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Hi @daniel-0000. As @BitSeeker said, the bug has already been fixed.
There was also another bug in Arduino IDE 2.3.5 which broke the IDE's auto-update feature. This is likely why you are still using the outdated 2.3.5 version. Due to the broken auto-update, it is necessary to download Arduino IDE 2.3.6 from the download links on the "Software" page of the Arduino website:
Then install the downloaded file as usual. The auto-update bug is fixed in 2.3.6, so when using 2.3.6 you will receive notifications of any future Arduino IDE releases, and be able to update via the notification as usual.
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Oh, the new version 2.3.6 has already been released!? I'll update and give it a try.
Good news, it works! 
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