SAC - Scale Formatting on stories: percentage not showing

I made a calculation on a story where I'm dividing a number to its total (occupancy rate for hr dashboard). Due to the nature of the model, the only way to achieve this is by adding a calculation on the story. (I tried adding values to the modeler but unsuccessful) I'm expecting it to be displayed as a percentage but I cannot click on it:

Any help is appreciated. Thank you!