Open your most-used AI tool's settings and find the data/training control (look for 'improve the model', 'data controls', or 'training'). You're done when you've written one line: tool name, setting found, current state — or 'no control exists, act accordingly'.
How-to · INF · INF.5
Find the training toggle
Consumer AI tools have settings controlling whether your chats train future models; know where yours is set.
Worked example
Somewhere in your AI tool's settings is a switch that decides whether your conversations help train future models. On personal accounts it often defaults to yes. You don't need paranoia — you need to know where the switch is and what yours says.