helldritch already answered for the UK. In Germany there is the Arbeitsstättenverordnung, the appendix requires non-reflective desktop and laptop screens (6.3 (2) 3 and 6.4 (2) 1): https://www.gesetze-im-internet.de/arbst_ttv_2004/anhang.htm...

There is also a similar European Union directive, however, that does not apply to laptops if they are used only infrequently (annex 1b): https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:01...

So while the rest of the world might differ, in the EU non-glare screens are usually required if you intend to sell to business customers.