Big Modals on landscape like multichoice on database are not closable

Test on one iPhone, and one Android. On master site, navigate to Database testing course. Enter database named: "New database using all field types English" on section "More databases" . Add a new entry. Edit the first field field named "A checkbox field name (required): " by clicking on the Choose select. A new alert would open. Rotate the phone to landscape. Check you can scroll the options and you can see Ok and Cancel buttons and it's all usable.