How many "Open Recent" choices?

It seems I used to have more choices printed to me when I clicked on File:Open Recent than I do now. Similarly, I’m seeing only four choices when I right-click on the OO icon in my dock. I used to have quite a few more. I’ve also opened some files recently that are not showing up in the dock’s context menu.

Is there a way to control how many choices are shown?

The Open Recent menu should be controlled by the System Preferences > General > Recent items. As for the context menu, I’m not sure, it isn’t accurate for me either.