Hi Abhishek.
Thank you for posting in Microsoft Community.
I understand that you are facing issues with missing toolbar in Bluestacks 5 application. This seems to be application specific and you may have to check with Bluestacks support.
However, based on my research, you may want to check the following support articles from Bluestacks.
Solution for missing top bar and side toolbar while streaming with OBS on BlueStacks 5
Side toolbar on BlueStacks 5 Beta – BlueStacks Support
Hope this helps.