Defragment on huawei p20 lite?

Does anyone know how to defragment on the huawei p20 lite and if it has the disadvantages in terms of my scores?

What do you want to defragment and why do you want to do that? Defragmenting usually only brings you something in mechanical storage, purely Electronic memory as they are usually present in cell phones get no advantage.

I have such a message accidentally clicked on it and then stood there 9 GB of 40 GB

Defragmenting is useful for some file systems on a hard disk.
Used with the phone or card memory makes no sense and brings nothing.

Yes 9GB of 40GB related to what?

On your phone are still 9 of 40GB free or what? In that case, defragmentation would not do anything because it does not clean up space.

Flash memory does not need to be defragmented