What an employer sees when you apply
When you apply for a job, the employer sees your Sebairo profile plus your cover note — not anything from the CV Builder. The app calls this your career card: your name and photo, work title, education, skills, about, city and country, and whether you are open to work.
Your profile is your application. Filling in the work title, skills and about fields is what improves what a hiring manager reads — the CV Builder is a private drafting space that only you can open.
The cover note is the one part you write specifically for each job, so it is worth spending time on.
Open to work
The "open to work" switch appears on your career card, and it is one of the things an advertiser can target an ad at. If you are looking quietly, know that it is a visible signal, not a private note to yourself.
You can apply once per job, and you can withdraw an application at any time; withdrawing removes it.
Your profile is already visible to any signed-in user — applying is not what exposes it. What applying adds is your cover note and the fact of your interest, shown to the people who handle hiring at that company.