Steps to reproduce:
Connect to the server.
When connecting to server, double-click window frame (see Environment) to make it fullscreen.
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Comments 2
Thank you for your report!
However, this report is Invalid.
Your game, launcher and/or server is modified.
If you can reproduce the issue in a vanilla environment, please create a new ticket - this is a bug tracker for the game, and not a support website.
Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang Studios or the Bugtracker.
Any plugin or resource pack issues need to be addressed to the creator of the plugin or resource pack.
If you have problems on large servers, such as The Hive and Hypixel, please contact them first as they run extensively modified server software.
Quick Links:
📓 Issue Guidelines – 🛠 Community Support – 📧 Customer Support – ✍️ Feedback and Suggestions – 📖 Game Wiki
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Looks like you're using a modded client, reports made with modded clients are not valid.