Assuming that you are using the WiX Standard Bootstrapper Application, your current BootstrapperApplicationRef might look like this:
<BootstrapperApplicationRef Id="WixStandardBootstrapperApplication.RtfLicense" />
WixStandardBootstrapperApplication has three variants as explained in the docs. HyperlinkLicense is the simplest. It has a license link on the welcome page instead of a license page. It allows you to specify an empty URL for the license, in which case it won’t display the link. For example,
<BootstrapperApplicationRef Id="WixStandardBootstrapperApplication.HyperlinkLicense">
<bal:WixStandardBootstrapperApplication
LicenseUrl=""
xmlns:bal="http://schemas.microsoft.com/wix/BalExtension" />
</BootstrapperApplicationRef>