hi, you said:
Some of my mock-ups have over 900 content frames. I know how to go in each frame individually and resize the image to 100% scale. But, I am looking for a way to resize all the content of my frames to 100% at the same time.
Also, I am not sure what you are trying to tell me with 'object styles'. That's a vague answer with no examples or description about where that is located.
By @lisa_BaumTextile
Yes, these option are availabe from your fitting options and with an object style you can control as many objects as you need.
This is how you make an object style, see below, and within the fitting options you can control the object fits withing the frame.
 
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