How to disable automatic cache clearing for Seadrive?

I am using SeaDrive 2 on Mac and I would like to be able to disable automatic cache clearing of files because I want to be keeping as long as possible the files on both my drive and online. I am basically using the online server sync for backup purposes. However, I want to be still be able to manually clear the cache for specific file or folder whenever I choose because I might exceptionally need to upload a file that is hundreds of GBs.