You cannot use non Unicode fonts to search in Wikipedia.
It is Wikipedia's policy to use Unicode fonts in international sister sites. And not Kaputa or Kandy or eKottu? Unicode is the international standard for non-Latin scripts.Helakuru is a mostly used Keyboard app among Sri Lankans in 2020.If you don't have Google Playstore installed, then you can download the Helakuru APK version. If you want to type in Sinhala using your Android smartphone, you can download the Helakuru Keyboard from the Google Playstore.You can type in phonetics, Wijeysekara layout or Singlish (ea kiyanne mehema type karana eka) and the program will type it in Sinhala on any open window (MS Word etc.).It's a small background program that intercepts what you type and converts it to the Sinhala unicode format.If you are using a version of Windows other than XP SP2, you can use the FutureSinhala keyboard driver to type in Sinhala unicode.Note: you will need to have your XP CD handy. You can copy and paste what you write in Wikipedia. This lets you type Sinhala documents in Microsoft Word.If you don't have Windows XP SP2 but have an older version of Windows and Microsoft Office XP, you can download the Sinhala Pack for Office XP here.You can type in Unicode just as easily as you do with any other Sinhala or English font.It lets you toggle seamlessly between typing English and Sinhala using the language button on the task bar.Read the instructions before you install it.If you have Windows XP Service Pack 2, install the Sinhala Enabling Pack for XP by clicking here (this has been developed by Microsoft and endorsed by the Sri Lankan government).Remember to choose Kaputa.Com or Malithi or other Sinhala Unicode font you have installed, when you do this. After following the above steps, you can use the Windows character map program to type in Sinhala.Change Character Encoding to UTF-8 Unicode in your browser ( VIEW->ENCODING in most browsers).
In Windows, right click on your Desktop, choose Properties, go to Advanced tab, click on Effects and choose Cleartype as the method to smooth edges of screen fonts.