Is it easy to switch to a different type of development?

I.e. going from desktop to web development, or to game development or systems development etc?

I should clarify that I know there would be significant work involved learning new languages and skills etc.

But I mean more the process of applying for roles where you have experience but not experience that is directly relevant.

Easier than starting from zero. One of my coworkers switched from game dev to web and he became really good after about 6 months, most of his experience transferred over. A junior would have taken around 3 years to get to the level he got in 6 months.

It can be relatively easy to switch between different types of development, as many of the core skills, such as problem-solving and logic, are transferable. You just have to spend a lot of time learning new things.