Thank you @bobbybouwmann for directing me, even though your solution doesn't work with me b/c my dynamic part is the query I want to remove from, not to leave in the url.
Fortunately, Arr::query() is exactly what I was missing to append a query to a named route with a parameter.:):):) I couldn't find that helper method in the Laravel docs.
@nakov Thank you so much for taking time to share, I was really stuck. Works great, and allows us to remove as many queries as we want, including 'page', which is very tricky with the fullUrlWithQuery() method.:)