TablePlus suggests as you type. Objects to be suggested includes databases, tables, keywords, columns.
You can change the Auto Complete options by clicking on the config/setting button at the bottom left of the editor and choose Autocomplete options. Select/unselect to include/exclude in the suggestion:
Auto prefix schemas
Auto uppercase keywords. You can also enable/disable this option via the app's preferences (⌘ + ,) at the General tab.