Step 1: Dashboard > Contact (Please be sure you installed contact form 7 plugin) > Click the “Add New” button.
Step 2: Input your contact form title name.
Step 3: Remove the default code from the form.
Step 4: And paste below code.

<div class="col-md-12"> 
    <div class="single-input">                                                                
        <div class="form-group">  
            [text* text-929 class:form-control placeholder "Full Name"]	                                                                                       
        </div>
    </div>
</div>  
<div class="col-md-12">
    <div class="single-input">                                                                
        <div class="form-group">                                 
            [email* email-772 class:form-control placeholder "Email"]                            
        </div>
     </div>
</div>          
<div class="col-md-12"> 
    <div class="single-input">                            
        <div class="form-group">                                        
            [textarea* textarea-111 class:form-control placeholder 10x5 "Write your message"]
        </div>
    </div>
</div>
<div class="col-md-12">                                                                 
    [submit class:btn-small "Submit Now"]                         
</div>

Step 5: Click the “Save” button.
Step 6: On top of the form. You’ll able to find out a shortcode like this:

[contact-form-7 id="6" title="Contact form"]

Step 7: Put this shortcode in the Elementor widget.

Please check the below screenshot-