Smart App Control blocks apps or parts of apps that Windows considers potentially unsafe or untrusted. Before trying to bypass the warning, make sure you trust the app and downloaded it from the official developer’s website.
First, check whether the app has an updated version, then try downloading and installing it again from the official source. If the warning continues, check the exact message and which file or component is being blocked.
Keep in mind that turning off Smart App Control is not a simple per-app exception, and turning it off may prevent you from turning it back on without resetting or reinstalling Windows, depending on your Windows version.
What app are you trying to open, and are you using Windows 11? If you share the app name and the full warning message, we can suggest the safest next step.