How to setup debug in Unity Editor when debug icon does not show in bottom right of the editor?

I am currently using the 2019 Unity version and I have noticed that both in 2019 and the 2020 versions the little "debug bug" icon does not show up in the bottom right corner of the Unity Editor. Additionally, when I go to visual studio code, there is no attach to unity option at the top and I can't go to the debug drop down because it also does not give me that as an option either. My problem is is that I am using the Mapbox SDK and I noticed that in the 2021 version of Unity when importing the Mapbox SDK, it shows a lot of errors in the console. I found a post where it said that the Mapbox AR part of the SDK creates issues and it is better to just use AR Foundation. I tried this in 2021 version, but I could not get rid of the errors and the setup for Mapbox with the access token never shows up. My question is - 1. How can I get around this in the 2021 version and get the setup to work or 2. How can I get the debug setup in the 2019 version?

I already have read and seen the information from the Unity link" Debugging C# in Unity" Referring to: Unity - Manual: Debugging C# code in Unity (unity3d.com)

Everything in this link I have tried but I just want to know how to get around the two questions I asked or if anyone has found solutions for this?

 

i am facing the same problem. the debug icon is not showing up. i am on unity 2019.4.16f. and vs 2022. nither i can attach the visual studio nor vs code. i install plugin also in vs code but in debugging vs code is not showing unity debugger.