Why does my font size change?
Zubtitle has various settings that can be used to change the styles of the captions. One of those settings is to force the captions to only appear on a specific number of lines in the video.
For instance, if you have this setting set to 2 lines, captions will always appear on two lines in the video.
If the Text lines setting is set, this setting will take precedence over all other settings. This includes the font size. The font size will change dynamically to force captions to fit on the designated amount of lines so the captions do not bleed off the edge of the video.
If your font size is changing through the video, change the Text Lines setting in the Text Styles tab of the caption editor to 'none.'