I hope you are well today and thank you for your question.

As discussed in the live chat that you can increase its width by adding the below CSS code in the Custom CSS option of Ivory Search plugin settings on the path Ivory Search -> Settings -> Settings

.k2t-menu li form.is-search-form {
 width: 1000px;
 max-width: 100%;
}

.k2t-menu li form.is-search-form label {
 width: 68%;
 display: inline-block;
 vertical-align: sub;
}

.k2t-menu li form.is-search-form label input.is-search-input {
 width: 100%;
}

Best regards,
Ivory Search Support

Thank you for sharing the site URL.

Please use the below custom CSS code to make it full width.

#content .is-form-style label {
    width: 90%;
}
#content .is-form-style input.is-search-input {
    width: 100%;
}

Thank you for sharing the site URL and the screenshots.

I can’t access your shared site page as it is getting redirected to the login page.

Please advise.

Also, please share the screenshot of the category that you have selected to exclude from search.

I hope you are well today and thank you for your question.

You can change its colour as described in the below topic.

Style SVG Spyglass Icon

Best regards,
Ivory Search Support

I logged into your site and saw the premium version of Envira Gallery plugin does not save image caption as normal WordPress image caption but saves it differently, therefore, it is not getting saved.

Could you please contact the Envira Gallery support to know whether they save the image caption data?