Q.Helichrysum petiolate leaves are turning brown
Plant is inside at south and west windows
Certified GKH Gardening Expert
This appears to be from overwatering. Treatment from here will be a fungicide.
This article will help: https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm
These plants get a little fussy in container. They will need to dry out pretty thoroughly between each watering, and even let to dry for some portions of the year. This article will offer more information on how to care for these plants indoors:
https://www.gardeningknowhow.com/ornamental/vines/licorice-plant/licorice-plants-in-containers.htm