Hi @pcakhilnadh
As @WarrenBelz says, it's not possible for two app builders to edit the same app in Power Apps studio at the same time.
To support dollaborative development, there are two broad approaches for multiple developers to work on the same app simultaneously.
The first is to divide the work into multiple components. Each developer works on a component in their own app, and at the end of the process, you would merge with the components into a single app.
https://powerapps.microsoft.com/en-us/blog/collaborative-development-for-powerapps-canvas-apps/
This technique provides a no-code/low code method for simultaneous app development. However, there is a disadvantage in that there are certain tasks that we cannot carry out through components (such as the inability to save data to a data source).
https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/create-component
The second technique is to extract the source code for the app, and for the developers to build the app using an IDE such as Visual Studio Code. This provides the most powerful way for collaborative development, and a benefit is that app builders can check changes into a source control system such as github. However, it is a 'code first' way of working and requires a deeper understanding of code, and a knowledge of the YAML language.
http://powerappsguide.com/blog/post/how-to-create-edit-canvas-apps-with-code-visual-studio
