I have been using Visual Studio 2026 since the insider version and it works with UE without issues - and I have uninstalled VS 2022, but I haven’t uninstalled the 2022 build tools (MSVC v143 - VS 2022 C++ x64/x86) as these are used in UE projects by default. The only problem I had was on one PC where after updating VS and UE to 5.7, opening any project failed with a message “Visual Studio C++ 2022 installation not found“. The solution was to open the unreal editor by creating a blueprint only project, and then change the Editor Preferences → Source Code Editor → “Visual Studio“. If the Source Code Editor is set to “Visual Studio 2022“, UE 5.7 tries to find the exact match and fails.
In UE 5.7 there is also an option to use the VS 2026 (experimental), but that option might also use the newer build tools that haven’t been fully tested.
EDIT: Correction, options “Visual Studio“ and “Visual Studio 2026“ should be the same if 2026 is the only one installed. Also, since UE 5.7, VS 2026 uses the 2026 toolchain - I now noticed that I no longer get a warning for using the older 2022 build tools…