There could be multiple reasons behind not seeing the Feature Requests mobile view.
Sometimes, the feature request page won't show if placed using the onCreate method of a particular view or activity. The best advice here is to place this method inside a button.
If your current Instabug plan does not include feature requests, the page will not be shown. Feature Requests are available starting from the Team plan.
Another possibility for feature requests not being displayed could be related to the SDK not being properly integrated. You can double check the integration steps here.
Lastly, make sure that feature requests are enabled by following the instructions here. It should be enabled by default; however, disabling feature requests will prevent the page from displaying even when manually invoked.