Hello Asmaan Imran Adam, thank you for posting in the community.
Are there any third‑party PowerPoint add‑ins installed? As a next step, please try starting PowerPoint in Safe Mode by holding the Shift key while launching the application. If PowerPoint works correctly in Safe Mode, this typically indicates that the issue is caused by add‑ins or corrupted preference files.
If the issue still occurs while in Safe Mode, proceed with removing the PowerPoint preference and cache files. Please quit all Office applications, then navigate to ~/Library/Containers and delete the Microsoft PowerPoint folder. After that, navigate to ~/Library/Group Containers and delete the UBF8T346G9.Office folder. Once completed, restart the Mac and relaunch PowerPoint to test.
Kind regards,
John Oli