A client wants to remove certain blocks/elements on a guided landing page while working. Is this possible?
It depends on what the element is. If you just don't populate it with anything, then it will appear blank usually, but it will leave a space where it should have been. You may have more luck toggling the whole section off and using a different section if your landing page template is set up that way. Unfortunately this is the blessing and curse of the guided landing page templates.
If it has not been set in the template itself, it cannot be done. Just empty it, setting an HTML comment in the ediable sections.
It is not difficult to set it up in the template, though. You will need a boolean variable to toggle the CSS display of the block, as in this example from the doc (Create a Guided Landing Page Template - Marketo Docs - Product Docs 😞
<meta class="mktoBoolean" id="boolean1" mktoName="My Boolean Variable" default="true" true_value="block" false_value="none" false_value_name="Hide" true_value_name="Show">