On the main page for the title it shows if it's available on a service but if there's more than one service offering it you can view them on the drop down menu. It may not have EVERY option, but it can be helpful.
Some other options for finding movies that are fringe/obscure are Hoopla/Overdrive which are free streaming services connected to various public libraries around the country but require a valid library card to "check out" a title.
Imbd.com also will list almost every streaming platform a title...