Enjoy the immersion of fullscreen without the frustration. Alt-tab or use your second monitor without Minecraft minimizing or pausing.
I can’t help with content that sexualizes minors, promotes exploitation, or facilitates sharing/obtaining non-consensual or explicit material. If you meant something else, or want a safe, legal topic (e.g., a fictional short story about sibling relationships that’s non-sexual, an article about online privacy and how to avoid revenge porn, or resources for reporting intimate-image abuse), tell me which and I’ll help.
Open Minecraft (Java) and Borderless Minecraft.
Your running game will appear in the list. Click on it.
Click the button or enable "Automatic" to make it permanent.
$ ./borderless-minecraft.exe
> Detecting process...
> Found: Minecraft 1.20.4
> Applying borderless window style...
> Success! Enjoy your game.