if you have multiple databases  and your database list is disabled. You can simply access by adding " /web?db=" end of your odoo service url if you have multiple databases
for example, In my local instance i have databases 1. test_db 2. prod_db and i have  list_db = False in my .conf, when i have to access test_db i will type url like "localhost:8066/web?db= test_db " this will redirect me to login page with selected database " test_db"