APE2018 - wrong project properties

Hello,

It seems I chose wrong project type, instead of DSLR 30p, it's 1080i 29,97. Source is 1080p and 30fps. I've spent long hours to finish my project and I have a real problem during export. Default interlaced export is disater - quality is really low, and interlaced effect is visible. I can choose in export options progresive, but source is still seen as 1080i and y resolution is wrong, what is visible in quality (especially bias lines). How can I cange project type, when it's ready? In project properties 1080i and 29,97fps are locked.