Don’t forget - if you’re worried about someone nicking your idea, then that will happen whether you keep it a secret now or in 6 months. Your strength is likely you, which nobody can steal (whether that be industry knowledge, connections, your team). If you’re building something in a month on Bubble, so can anyone else!
I’ve never touched openBuild, seems to just be a UI library which is fine. Navigation is generally best done through URL parameters in a single page app. There are a few approaches to it. @rico.trevisan has made a video of his approach: Single-page application framework: App Shell [free tutorial]
For multi-page apps, navigation’s pretty straightforward as it’s just Go to page…
Best of luck!