I thought I post this, as I found it to be an informative page on Silk Browser Settings and their functions on Fire Tablets:
You can change Silk Browser settings, such as privacy controls or the default search engine, to customize your browsing experience on your Fire tablet. Help for 4th Generation, 5th Generation, 6th Generation, and 7th Generation Fire Tablets.
To access settings for the Silk Browser, swipe from the left edge of the screen, and then tap Settings.
Search Engine - Select Bing, Google, or Yahoo! as your default search engine.
Auto-Fill Forms - Fill out your contact information on web forms with a single touch by saving form data for later use.
Save Passwords - Select this option to save your user names and passwords for websites that you visit often.
Accessibility - Manage Accessibility settings within the Silk browser.
Text Scaling - Drag the slider to increase the size of the text in the box. Text should look this big after double-tapping on a paragraph.
Force Enable Zoom - Select to override a website's request to prevent zooming in.
Privacy - Manage Silk browser Privacy settings.
Do Not Track - This setting requests that websites do not display ads based on your browsing or search history. However, websites may choose to ignore these requests.
Clear Browsing Data - Control your privacy by deleting your browser history, including websites you've saved, saved passwords, and personal information added to forms.
Cloud Features - Allow Silk to use the Amazon Cloud for faster web page loading with Instant Page Loads, support Flash video content using the Experimental Streaming Viewer.
Site Settings - Manage settings for websites visited in the Silk browser. You can manage settings for all sites or for individual sites.
Cookies - Cookies are enabled by default, but you can turn them off and on.
What is a cookie?: Cookies are small packets of data sent from a website and stored in the browser when you visit the website. Cookies retain user information (such as your preferences or settings), so that the next time you visit a website, you can pick up from where you left off (for example, proceeding to checkout on Amazon with items left in your cart from a previous browsing session).
Location - Allow sites to request access to your location. When a website wants to use your location data, Silk will prompt you at the bottom of the page. Tap Allow to send your location data to the website, or tap Decline to ignore the request.
Camera - Allow sites to request use of the camera on your device.
Microphone - Allow sites to request use of the microphone on your device.
Notifications - Turn website notifications on or off.
Images - Allow images to be displayed.
Pop-ups - Select to allow pop-ups.
Full Screen - Select Allow full screen or Ask First before changing to full screen.
Protected Content - Some music or movies that you download or stream on Silk might be protected by copyright. These sites might ask you to identify your device before you use it to see protected content. If you don't want these sites to have access to your device identity, you can block this info from being shared.
Becky, I am not seeing the "Full Screen" setting on my new Kindle Fire 10 HD, even though all of the rest of the settings you describe above are there somewhere (e.g. "Protected Content" moved under the "Media" subheader). Did this move? I can't imagine why anyone would remove this. I really, really need this functionality for a specific web site designed around full screen.