The screener lets you select the countries where you want to invest.
If you select a country the screener will include all companies that are registered in that country, or in other words the country where its head quarters is located. This solves the problem, for example, caused by Microsoft which is registered in the USA but listed on numerous exchanges worldwide.
Here you can see all the countries included in the screener: Countries available in the Quant Investing stock screener
How to select countries
To select only the countries you want to screen for ideas in simply click the drop down arrow below the Countries heading.