How to remove Sidebar from Archives Page?

In Wordpress Admin Panel go to Appearance > Editor section

After opening Editor Section Click Toggle Navigation > Templates > Archive which in on left top corner of Editor Section Screen.

Once Archive Page is Open, Click on List View Open Hierarchy of Group in Group open Columns select second Column.

Click on 3 dots and tap Remove Column. Before you remove the column make sure you've verified that you've selected the correct Block in Block Editor.