It really needs a lot more light than you're giving it. Right up in front of a south facing window would be preferable. What type of soil is it in? How large is the pot? Does the pot have a drain hole? How often do you water? What do you use to tell it's time to water? How often do you fertilize? And with what?

Hi Eva I would like to jump on to this discussion as I have had the exact same thing happen (bought fiddle leaf in winter Adelaide, Aus and new leaves quickly dying). However my new leaves are also developing with lots of tiny red and brown spots all over them (see photos attached). I have tried everything from fertilising, moving the plant away from direct light, into more light, watering more or less - I feel deflated that all of the new leaves are dying! If anyone has any wisdom on this topic it would be much appreciated from the both of us I’m sure!

Okay two major problems I'm seeing: Brown spots on leaves that fell off look to be due to overwatering, a lack of air in the soil and/or salt buildup. The reddish spots underneath your leaves are called oedema and can be caused by a number of factors, most often by excessive water retention in the soil (which I think is mostly your problem). Additionally, Fiddles don't really like to be moved, so while giving them optimal light is great, changing their living conditions so frequently can cause them to drop leaves like this. If you can move it outside for the summer, they tend to thrive. Some people even keep them in full southern sun and they love it. Even if you end up burning the leaves and they fall off, they will bud right back out with leaves that are suited to that amount of sun. I put mine right into morning sun today and kind of expect to lose some leaves to this but they'll bud right back out. If I've learned anything from all my research and time with my plant it's this: they are pretty hardy and will bounce back. I don't think you'll lose the plant if correct your watering issue! Here's a link to a post with the holy grail of information about every problem you think you could possibly have. There are several posts about the spots your seeing on your leaves and a guy named Al has some awesome advice I would recommend reading! The post is huge but I would suggest just scrolling down looking for pictures of whatever problem you're experiencing and read responses (that's what I did and I learned A LOT! [https://www.houzz.com/discussions/pruning-ficus-lyrata-fiddle-leaf-fig-dsvw-vd~1458685[(https://www.houzz.com/discussions/pruning-ficus-lyrata-fiddle-leaf-fig-dsvw-vd~1458685)

bump, wondering if anyone might have any isights here