Welcome to the forum.
First, a few questions:
When you say "rendering," are you referring to hitting the Enter/Return key, to create the smoothest possible playback? If so, that is what PrE refers to with Rendering.
Or, do you mean outputting your Timeline to an AV file? Some other companies refer to this as rendering.
Now, and with either one, do the two "brackets" of your WAB (Work Area Bar) enclose the entire Duration of your Timeline? The WAB can be uses to limit either Rendering, or Publish+Share for the Timeline.
See this image:
Good luck, and please let us know a bit more.
Important details always to be included
a. Version of Premiere Elements
b. Computer Operating System on which Premiere Elements is running.
Other details of your project settings, source media properties, and other may be needed as the discussion evolves.
Comments below assume some version of Premiere Elements on some version of Windows.
If your details support that the settings of the gray tabs of the WorkArea Bar is at the core of your issue, then I would offer the following shortcuts for setting them as opposed to a manual set using the mouse curse.
Place the Timeline Indicator at the beginning of your Timeline content.
Hold down the Alt key of the computer main keyboard as you hit the left bracket key [ of the computer main keyboard.
Then move the Timeline Indicator to the end of your Timeline content.
Hold down the Alt key of the computer main keyboard as you hit the right bracket key ] of the computer main keyboard.
If you details indicate that the WorkArea Bar gray tabs' placement is not the issue, then we can explore other troubleshooting paths.