I have two bonsai trees first one is a chinese mrytil and have had since April this year which apart from watering when feeling dry has not had anything done yet, the leaves on this one are looking dried out however it is shooting new leaves, I didn't think these lost leaves when living indoors (correct me if I'm wrong on this please)I'm not sure if there is something wrong or I'm missing something that I am doing wrong.

My second tree is a fictus which I have had for around 2 years and was full of leaves this one grows leaves but not long after drops them I tried repotting ensuring roots good I'm doing nothing different that I hadn't done since I got it location and temperature are well in the recommended.Given it still produces new leaves I'm puzzled again watering I keep it moist and check soil daily so really at a loss whether tree is ever going to become the tree it was.

The trunk thickens every year it is alive. The stronger the tree the more it thickens.

Your trees is very weak, so the thickening might not be noticed without a mikrometer.

Growing trees in living room conditions seldom works. Most of them gets weaker and weaker until they die.

Thank you for your response
Does this apply to both of the trees if so do you have any suggestions that I can carry out to save them

If you are in the northern hemisphere south of copenhagen, put the trees outside. First in shade and then slowly move towards more sun. As summer approach, there is a slight chanse of survival. And of course......As soon as you know they have survived start planning for better winter home for them.

I'm in the uk so as you can imagine tempriture is not quite above 15 degrees I will however move them outside and hopefully they will start to recover
Thanks for your advice

I am in Sweden and most of my trees are outside year round. Some protected in unheated greenhouse in winter.

For beginners is better to go for locally hardy species and keep them outdoors year round. So much easier.

Ficus wants to be above 10C, so it can spend most of the year outside.

The other one can probably handle 15C much better than a living room. Look up climate zone where it evolved and you can probably leave it outside with only some protection from wind.