Can I update the basic ui of frappe next

Hello,
I want to update the basic ui for the erpnext. how can i reflect the changes?
I want to change the name of Projects to Main Task.
I want to update the view of workspace
I want to display list of projects according to companies. e.g. company1 → list of projects, company2 → list of projects

Create a custom app to hook external css.

Not possible, try Custom Translation doctype.

You can always customize / create new workspaces. It’s pretty easy.

Use list filters

Above are the easiest solutions. If you are more technical you can build custom desk pages, custom web pages or complete SPAs that suit you.

You can also try Frappe Studio which is a low-code web app builder