Movies my four year has enjoyed:
Maya the Bee
Sing
Zootopia (one or two scary scenes)
Disney classics (Snow White, Cinderella, Lady and the Tramp, etc...) - you have to get over some of the racism/sexism though, tbh, but these have fewer scary scenes than newer Disney
Moana (Takaa is a little scary and required some hand holding)
Frozen and Frozen II
Movies my four year old has found terrifying:
Toy Story