Yes it does. Here's a short article that explains the differences between different types of flours: Different types of flour
If you really want to kick up the gluten you can add Vital Wheat Gluten to your mix.
Here is a recipe with pictures for Ciabatta That shows you the technique, click where it says Recipe for the actual recipe. Take note that this recipe actually uses a Poolish rather than real sourdough starter, but if you have starter you can use that instead.
Just a little note on King Arthur: they decided to go woke and made a big donation to the SPLC, an organization that brands anyone opposed to the Democratic Party platform as a "Hate Group" I use their website, love their tips and recipes but won't buy their products.
Finally, if you have a Facebook account you can join groups like Sourdough Bread Baking that has recipes, tips and advice from bakers of all levels from around the world.
Thanks!