bug

it wont let me scroll so i cant adjust the settings and i have to search for blocks, and i have to double click evrything. also its excessively laggy and i closed out all my apps and nothing changed..??? also i was building a roller coasted with scaffolding and it gradually got really difficult to do after only a few blocks high. the main problem was the lag and also the fact that when i was trying to make it go higher one block at a time, it kept putting a block on top of the previous scaffolding which would make the roller coaster unable to work. it was on bedrock so pls fix it mojang 😀