increase maxlenght meta title and meta description of product

[nahweb]

Hi to all, I installed version 8.1 and imported products from another prestashop, everything was fine, everything was imported correctly, my problem is that when I want to modify an existing product it gives me a character limitation error in the meta_title and meta_description of the product, the meta title stops me at 60 characters and the meta description stops me at 160, I modified classes/Product.php and checked the database and it allows me to register up to to 255 characters on the database, in fact all the data is reported on the database and has not been truncated.
Could you tell me where to intervene on the js file that manages this limitation and allow me to save the changes on an existing product?

[TiaNex Shopping]

you'd better not to change the length, for the max title length of google(bing) is 70,

all the default suggestion is right