user36636: I just went in manually and added a single frame before the change in font size a frame where the font is the previous size. Is manually adding a frame one frame before the change the best way to make the font change in size instantaneously or is there a more formal way of doing it?
I also tried changing the easing to be instantaneous by going in a single frame prior and adjusting the easing speed to be 100% in a single frame as well, which worked.
I just don't want the frame time stops section to get messy with so many time stops. Is this the right way to do it still?

user4426: You need to use a hold keyframe. Right click the keyframe, select hold frame.
Each time the play head gets to a hold frame, the value will jump to that keyframe value with no interpolation.
https://helpx.adobe.com/after-effects/using/keyframe-interpolation.html

36636: <p>I just went in manually and added a single frame before the change in font size a frame where the font is the previous size. Is manually adding a frame one frame before the change the best way to make the font change in size instantaneously or is there a more formal way of doing it?</p>
<p>I also tried changing the easing to be instantaneous by going in a single frame prior and adjusting the easing speed to be 100% in a single frame as well, which worked.</p>
<p>I just don't want the frame time stops section to get messy with so many time stops. Is this the right way to do it still?</p>
 4426: <p>You need to use a hold keyframe. Right click the keyframe, select hold frame.</p>
<p>Each time the play head gets to a hold frame, the value will jump to that keyframe value with no interpolation.</p>
<p><a href="https://helpx.adobe.com/after-effects/using/keyframe-interpolation.html" rel="nofollow noreferrer">https://helpx.adobe.com/after-effects/using/keyframe-interpolation.html</a></p>
