Elementor

Elementor is a WordPress third-party page builder, the Flexmls IDX WordPress plugin has been compatible with Elementor since version 3.10.

In your default WordPress page editor click on the Edit with Elementor button…
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In the left column scroll down through the list and find the Flexmls option:

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Drag and drop a flexmls widget to the Add Element box. The widget settings will appear in the left column:
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Please see our Widgets page for more information on each widget option