However, I succeeded I edited the template's css file
../themes/classic/assets/css/theme.css
	and added img in the tab-content> item
	img {
	     display: block;
	     max-width: 100%;
	     height: auto;}
after modification, the code looks like this in this passage
	tab-content>.active{display:block;}
	img{
	    display: block;
	    max-width: 100%;
	    height: auto;}
	.navbar{position:relative;padding:.5rem 1rem}
I checked the presta 1.7.6.1 version on standard template with the description window enlarged to the full window according to my description
https://www.presta-polskie-wsparcie.pl/strona/presta-1-7-szersze-pole-opisu-produktu
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