If you use an interface overhaul like ElvUI or Bartender, those addons may be overriding the default game settings. Check the internal "General" or "Media" settings within those specific addon menus.
The default "scrolling combat text" is functional but basic. Most veteran players prefer using addons to customize the font, size, and animation style of their damage numbers. how to enable damage numbers in wow
To turn on damage numbers, type the following command into your chat box and press Enter: /console floatingCombatTextCombatDamage 1 If you use an interface overhaul like ElvUI
This is the most popular choice for organizing data. It moves damage and healing into clean, customizable columns so they don't clutter the center of your screen. Most veteran players prefer using addons to customize
If your settings feel "bugged," you can reset all console variables by typing /console cvar_default . Warning: This will reset all your custom interface settings to factory defaults. To help you choose the best visual setup for your gameplay: Are you playing Retail , Classic , or Hardcore ?
This addon attaches the damage numbers directly to the enemy's health bar (nameplate). This makes it much easier to track which target is taking damage in large group fights.