To fix the indentation and formatting in all files of your solution:
- Install the Format All Files extension => close VS, execute the .vsix file and reopen VS;
- Menu Tools > Options... > Text Editor > All Languages > Tabs:
- Click on Smart (for resolving conflicts);
- Type the Tab Size and Indent Size you want (e.g.
2);
- Click on Insert Spaces if you want to replace tabs by spaces;
- In the Solution Explorer (Ctrl+Alt+L) right click in any file and choose from the menu Format All Files (near the bottom).
This will recursively open and save all files in your solution, setting the indentation you defined above.
You might want to check other programming languages tabs (Options...) for Code Style > Formatting as well.