Not real clear on your question. Are you missing the columns for what you listed in your Inbox display? If so at the far end of the Inbox header there is a small icon. Click that for a list of possible columns to display.

You can uninstall the program and not lose your settings and emails since they are in your profile and not with the program. This rarely solves anything though. Since your setup is in the profile, the new install will pick that up and you will be right back where you started, just later in the day.

Please use https://support.mozilla.org/en-US/questions/995725#answer-562245. I will make this comment as a solution to force it's demise.