For the first, you could hide the navigation pane. In the OnOpen event of your switchboard add:
DoCmd.NavigateTo "acNavigationCategoryObjectType"
DoCmd.RunCommand acCmdWindowHide
Or go to file, options, current database and uncheck 'display navigation pane'
For the second, You can locate the tab by going to file, options, customise ribbon... then remove the items. It will look something like:
you could also research creating your own custom ribbon
another option is to add the following to the OnOpen event of your switchboard:
DoCmd.ShowToolbar "Ribbon", acToolbarNo (this will hide the ribbon completely)