You can also try to modify the symbol library and resize all the symbols standard that you are using. (JIC,IEC,JIS...)
Schematic tab> Other Tools panel> Symbol Builder> Modify Symbol Library
Select the folder containing the library symbols you wish to convert and press OK.
Just rescale the symbols to what scale you want.
Remember to backup the lib folder first in case the scaling is not right.
Warning! Do not use the Feature Scale Multiplier for metric to English conversion. It happens to scale everything but it is intended to scale features, like dots, angled tees, wire offsets when connecting two wires to the same wire connection, etc. If you try to use it for metric to English conversion, it throws off the trap distance and can adversely affect wire numbering, terminal numbering, and more. I suggest that you not use the FSM to scale by more than a factor of 2 and not less than 0.5. In that case, use the Modify Symbol Library utility. Be sure to make a backup copy of the library folder and its contents before you change it. Hint: It is best to temporarily move the library you wish to modify to the root of your drive. The utility sometimes has problems with a long path to the symbols.
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