The case: I created a custom object. After that, I need to give permissions to all profiles. I have a lot of profiles. And editing each one is time-consuming. Is there a way to update all profiles at one time?
The way to do this in 2019 is to create a custom Profile List View and edit Object Permissions en masse.
See the Salesforce documentation of the process here: Edit Multiple Profiles with Profile List Views
If enhanced profile list views are enabled for your organization, you can change permissions in up to 200 profiles directly from the list view, without accessing individual profile pages.