First, if you had all you formulas in a style (formatting style), you could just adjust the style (like there). This is right way to format whole document, by the way, not just formulas.
Second, depending on uniformity of formatting you have, you may try to use “Search and replace” dialogue to find your formulas by formatting (this is, by Indent) and re-format them. To do that:
- Edit → Find & Replace (
Ctrl+H
)
- [+] Other options
- Put cursor to Search for field, clear it from any text, and click Format button. Select formatting your formulas currently have. After OK in Format dialogue, you’ll see that selected formatting appeared below Search for field.
- Put cursor to Replace With field and click Formatting again. Set formatting you want to apply.
- Replace to make it one-by-one or Replace All to change all formatting. You still have undo, and, hopefully, backups, so you can experiment to find appropriate formatting parameters.