The answer is obviously yes; you've had passports from another country.
The question is very simple. It's not asking if you have another country's passport or any other travel document at this moment, it's asking if any other country ever issued a passport or other travel document to you.
There are multiple sections for travel history:
one for the UK
one for the US, Canada, Australia, New Zealand, EEA and Switzerland
and a final one for other countries.
Travel to Switzerland goes into the second one, not the last.
UK Immigration Rules don’t specify a minimum savings/income requirement. https://www.gov.uk/guidance/immigration-rules/immigration-rules-appendix-v-visitor-rules What matters is that an applicant has sufficient funds available to them to cover the costs trip, and that those costs are proportionate to their overall financial situation.
One cover letter ...