Hi,
1) Please provide details, which settings?, if it is the widgets you can setup the widgets again.
2) To disable the Below title bar with author name, turn Off the last setting
https://themonic.com/wp-content/uploads/2019/06/Iconic-One-Pro-Options-main-settings-updated.png
You can also disable the first setting in the above to disable Author ID below excerpt on home page.
3) To remove credit link uncheck
Go to the Footer tab in the Options Panel and remove the tick from the Footer Credit link option
Above screenshots can be found in the docs below for reference