Example:
In Team Explorer, right-click FMRental.xml, and select Compare with Latest Version.

* Choose Compare with Latest Version to see how the changes you have made compare to the latest version of the file on your Team Foundation Server.
* Choose Compare with Workspace Version to see what changes you have made to the version you checked out.
D: The diff tool of Visual Studio is very good to compare two files.
It compares, and if it is possible, displays differences between two files, files in two folders, or a shelveset and a local or a server file.
Syntax:
tf diff[erence] itemspec [/version:versionspec] [/type:filetype]
[/format:format [/ignorespace] [/ignoreeol] [/ignorecase] [/recursive]
[/options][/noprompt][/login:username,[password]]
Reference:
https://docs.microsoft.com/en-us/azure/devops/repos/tfvc/difference-command