Regarding the Vocabulary export, can you please check your spam folder? If it’s not there, please give it another try and let me know.
You can only change the status of selected LingQs on the same page, you can change the status of all 30k words at once.
Also, please note that words that are on status 4 or checkmarked are already considered Known and included to your Known words stats. However, they will still appear as underlined in a lesson. This is only for words you made known but have them saved in Vocabulary first. Words you make known directly in a lesson (blue to white) without saving them to the Vocabulary list first, won’t be underlined.
Hope this explains it.