You may want to give certain team members the ability to produce proposals without permitting access to the admin area. You can do this from within your team settings.
How To Control Team Permissions
Step 1. Go to the Settings > Team page of your app.
Step 2. Edit the team member with the access you want to restrict
Step 3. Un-check 'allow access to admin area'
Here, you can determine whether or not you'd like this team member to have access to the admin area.
Step 4. Update the user