Visual Studio not saving changes?

Question

Hi Team,

I am currently running Visual Studio 2019 and using the "Import from Server (Tabular)" when creating a new project.
However, I am finding issues with Visual Studio not saving my changes.

For example;
I would amend a table by right-clicking and selecting "Table Properties..." and then clicking "Design" and will then begin to make my changes through the prompted Power Query Editor. After that, I click "Close & Update" and then "Ok" in the 'Edit Table Properties.

However, when I click save and exit and reopen my sln file, none of these changes were saved.

Does anyone know why Visual Studio won't save any table amendments?

Cheers,