Not sure how big of a gap you have, but if you can find a baseboard or molding trim that covers it, I would lay that around the floor or base of the walls and tub.
We purchased a new to us home that is actually 45 years old. The downstairs flooring was replaced with a wood type flooring. They had really old carpet on the stair...
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My bathroom tile is ceramic, and was clearly installed poorly, there is about a 3/4 to 1" gap between the tub and the floor tile, it currently has caulk to fill the g...
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Baseboard. Either tile or wood.
Not sure how big of a gap you have, but if you can find a baseboard or molding trim that covers it, I would lay that around the floor or base of the walls and tub.
vinyl baseboard molding.
https://www.menards.com/main/flooring-rugs/wall-base/c-6613.htm