My Microsoft Word keeps glitching and does not allow me to choose my Headings

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Hello @SITI AISYAH ROSTAM KHAN @ ROSTOM KHAN

Welcome to Q&A forum!

In this case, you are encoutering two concern:

• Heading Selection Glitch in Microsoft Word
• Random Alphabet Pop-Ups When Switching Applications

To ensure I fully understand the issue you’re experiencing, I’d like to confirm a few details:

1/ Could you still access Microsoft Word via the web version Word?

2/ How long has this issue been occurring on your end?

Please double-check to see if you can use it as a workaround during troubleshooting this issue.

Additionally, I would like to provide some troubleshooting steps to help you verify this issue:

1. Launch Excel in Safe Mode

Starts Outlook without any add-ins or custom settings that might be causing problems.

• Press "Windows + R".
• For Word: Type "winword /safe", and click OK.
• Try logging in again.

Open Office apps in safe mode on a Windows PC - Microsoft Support

2. Update your Microsoft Word

File -> Account -> Update Options

3/ Repair Office application

Please refer this article and my below image to do it:

Repair an Office application - Microsoft Support

• "Settings" -> "Apps" -> "Installed apps"-> "Select the Microsoft 365 or Office product" you want to repair, click the ellipses, and select "Modify".
• Click Yes and choose "Online repair" 

Looking forward to hearing from you!

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1/ Could you still access Microsoft Word via the web version of Word?

• Yes

2/ How long has this issue been occurring on your end?

• For about 2 weeks

Also, it appears that I have solved the issue. It was caused by Discord Overlay. Once I removed Word from Discord's "Registred Games" and restarted Word, the issue seems to have been fixed. Regardless, thank you for your answer, I will know what to do next time it happens again :)