The only thing that I have found that works, at least in a Chrome browser is to use incognito as follows:
**You can copy the following to a new test case and give it a try.
Maybe others would have a better solution.
//Add the following to the end of the 'import' section in your test case
import com.kms.katalon.core.configuration.RunConfiguration as RunConfiguration
import com.kms.katalon.core.webui.keyword.WebUiBuiltInKeywords as WebUI
//Start of test steps:
//Using incognito disables the 'Save Address' dialog
RunConfiguration.setWebDriverPreferencesProperty('args', ['--incognito'])
WebUI.openBrowser('https://en.wikipedia.org/wiki/Main_Page')
//More test steps that would result in a 'Save Address' dialog opening.