Want UK English but getting UK and US English (sometimes)

I have installed the UK language pack. When I hit F7, I can see that English (UK) is the Text Language (and it is the only option) which is fine. But I am still getting some words that are marked ok (like tire, organization) while others (like color) are flagged as misplelled for the UK. Is there a way to remove US engligh completely? Or figure out what the deal is above? Thanks!

What is important is not what F7 says but what’s displayed in the bottom status bar. There, Writer tells what language is currently active at cursor position (because you can have several languages in a single document). What is shown there?

Edit your question to provide additional info, notably OS and LO version. Or use a comment after mine. Don’t use your answer, unless this is a solution to the problem.

OS: Ubunto 18.04.1 LTS
LO: 6.0.7.3

Language below (on bottom status area) is English UK. Can even highlight a world like “Tire” and it shows English UK. Could it have been added in a custom dictionary? Is there a way to blow away all custom dictionaries or search in the custom dictionaries? Or a way to see why Tire is not shown as an error? Maybe it is actualy in the English UK dictionary? Thanks!

I suspect that both the “s” and “z” variants of words (organization, organisation) are either in the English UK dictionary or have been added to the custom dictionary?

Removed LO and reinstalled - still getting the US spellings.

Now on LO 6.3.4.2

First, a small linguistic question: isn’t tire a valid word in the British English in the sense of become / make bored or exhausted? I guess, it is. So, why should it be marked as a spelling error? A similar question about -ization/-ize forms. Aren’t they acceptable now as just variants in the UK?

Well, if the text is formatted as English (UK) but you still get americanisms, probably, the English (UK) dictionary installed with the language pack is not good for you. Perhaps, you should get a fresh word list from here and use it to replace the existing one.