Thank you for your question and patience, Yolanda.  The primary causes of pale to white leaves in ferns is either a misapplication of fertilizer, or low light.  You don't indicate whether you provide a source of additional humidity for your fern, and, because our homes tend to have very low humidity in the winter, the plant reacts this way.  Since they are tropical in nature, they are used to 50% relative humidity and higher.  If the plant is not getting enough filtered light, photosynthesis slows down, and the plant loses the chlorophyll that produces the green appearance.  Temperature, too, is a common cause of white leaves, and plants exposed to drafts from windows and outside doors often develop this whitening.  I am afraid I just don't have enough information about how you care for the plant to pinpoint the problem, but perhaps the information contained in this Extension article may help:  https://extension.umn.edu/houseplants/tropical-ferns#maidenhair-and-staghorn-ferns-1424815
Good luck!

Thank you so much!

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Welcome!