The subtitle file is created in parallel with the video file (if the Video caption setting is active under the camera settings) & not burned into the video file itself...
So you have a couple choices if you don't want to permanently/temporary use/see them...
1. Turn Video Caption off in the camera settings in the DJI GO4 app... the file will not be created at all.
View attachment 170821
2. Just play the video file from another location than where the .srt file is stored... meaning no subtitle file is accessible when playing the video.
3. Turn off subtitles in the player you use to play the video... meaning the subtitle will be disregarded during playing that video.
4. Use a video player that don't handle .srt subtitle files... meaning the .srt can't be read during playing the video.