How to open the menu / more options in Android devices without the menu navigation button?

One of the problem I faced with my Samsung Galaxy Tab A 6 (10.1", S Pen, LTE, SM-P585Y) Android tablet is that, although it has a Home button, a "Recent Apps" button and a "Back" button, it doesn't come with a "Menu" button which certain apps rely on to bring up their More Options menu.

Anyhow, there is a workaround solution for this, by using the Accessibility Assistant Menu.

To enable this, go to Setting > Accessibility and select the "Dexterity and interaction" option.

Then, select the "Assistant menu" option inside the "Dexterity and interaction" menu.

Switch on the "Assistant menu", and you will see this floating action button appear on the screen:

Tap on it and you will be able to see the "More options" soft button.

In your app, tap on this "More options" to bring up and access into its menu settings.

You can switch off this "Assistant menu" after use. The floating action button will disappear from the screen when it is switched off.