This will put dollar sign on the left and right justify the number

Use this custom format

_($* #,##0.00_);_($* (#,##0.00);_($* ""-""??_);_(@_)

Ref:- https://www.extendoffice.com/documents/excel/3679-excel-align-dollar-sign-left.html

To only show the dollars (but not the cents

_($* #,##0_);_($* (#,##0);_($* "-"??_);_(@_)