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Unfortunately, they are quite sensitive to their environment, and ANY change. Being a complicated subject, this will take practice to dial in the conditions that the tree likes. Likely, more light, less water. It could be a number of issues, though.

https://www.gardeningknowhow.com/houseplants/ficus

This will depend on proper care! It can take several weeks to a few months for it to settle in, but it will need very constant conditions to be happy. These articles will help:

https://www.gardeningknowhow.com/houseplants/ficus

Unfortunately, you probably won't be able to get the berries to stop. Also, leaf drop is normal and unavoidable. It can be minimized by keeping the environment the same, all of the time, which is impossible outdoors.

If you are noticing any other symptoms, such as browning or leaf rotting, then it could be fungal issues, as well.

This article will help:

https://www.gardeningknowhow.com/houseplants/ficus/ficus-losing-leaves.htm

This collection of articles will help with more general information on Ficus:

https://www.gardeningknowhow.com/houseplants/ficus

Ficus leaves tend to drop when any stress occurs. Most often it is an environmental issue, such as change in seasons, temperature change, humidity change, etc.

Try increasing the watering and see if that helps. Low water will cause leaves to yellow and drop.

If you are concerned about them being close to water lines, then it will be best to consult the professionals or an extension service in your area. However, if you would like to take on the task yourself then this article will help:

https://www.gardeningknowhow.com/ornamental/trees/tgen/transplanting-trees.htm

This will help you to find your closest extension service:

https://www.gardeningknowhow.com/extension-search

You could try growing these in container:

https://www.gardeningknowhow.com/edible/fruits/figs/growing-figs-in-pots.htm

Pruning roots on a Ficus lyrata (Fiddle Leaf Fig) is safe when done during repotting, typically every 2-3 years. Use sharp shears to trim circling or congested roots, avoiding more than one-third removal to prevent stress. Ensure well-draining soil in the new pot to prevent root rot. Adjust watering post-pruning, initially watering slightly less. Monitor the plant's stress, adjusting care as needed, as Ficus lyrata is sensitive to environmental changes. If unsure, seek advice from a local nursery or plant care professional for optimal results.

https://www.gardeningknowhow.com/houseplants/ficus/ficus-tree-care.htm