The answer depends on which of the 23 SeleniumBase Syntax Formats you use.

If you're running tests with pytest, there are several command-line options available: (See pytest Options).
Eg. You can set the agent with --agent=AGENT. Start maximized with --maximize. Add any option you want with a comma-separated list: --chromium-arg="ARG1,ARG2=SOMETHING".
Find example tests in SeleniumBase/examples. (The pytest ones start with test_ or end in _test.py.)

You can also override browser_launcher.py with Syntax Format 9 or 10 and use options.add_argument() directly, but you will lose all the special SeleniumBase modes such as UC Mode (the most popular one). Example: test_override_driver.py.

If you're using the Driver() manager format, there are several method args available, such as agent="AGENT", maximize=True, chromium_arg="ARG1,ARG2=SOMETHING", etc. Example: raw_driver_manager.py.

Note that many of your options are already set by default. (Find them in seleniumbase/core/browser_launcher.py) If you try to set something twice that was already set, you may encounter issues. (This could be possible if you are setting options with chromium_arg instead of via standard SeleniumBase options or method args.)