I'm Shrinking

Innerspace (1987) and shrinking movies.

https://slate.com/culture/2015/07/shrinking-humans-in-movies-supercut-ant-man-is-far-from-the-first-miniature-film-character-video.html

https://www.denofgeek.com/us/movies/shrinking-movies/247821/the-incredible-shrinking-movies