To modify in theme, you don't need to have the source code. Open Themes > NobleTheme > Views > Product > ProductTemplate.Grouped.cshtml (also in ProductTemplate.Simple.cshtml). Replace the code from line# 105 to 134 by this given code.
<div class="product-details-tabs">
<ul class="nav nav-tabs">
@if (!string.IsNullOrEmpty(Model.FullDescription))
{
<li class="active"><a href="#description" data-toggle="tab">@T("products.compare.fulldescription")</a></li>
}
@*@if (!string.IsNullOrEmpty(@Html.PartialAsync("_ProductTags", Model.ProductTags).ToString()))
{
<li><a href="#tags" data-toggle="tab">@T("Products.Tags")</a></li>
}
@if (!string.IsNullOrEmpty(@Html.PartialAsync("_ProductSpecifications", Model).ToString()))
{
<li><a href="#specification" data-toggle="tab">@T("Products.Specs")</a></li>
}*@
</ul>
<div class="tab-content">
@if (!string.IsNullOrEmpty(Model.FullDescription))
{
<div class="full-description tab-pane fade in active" id="description">
@Html.Raw(Model.FullDescription)
</div>
}
@*<div class="product-tags tab-pane fade" id="tags">
@await Html.PartialAsync("_ProductTags", Model.ProductTags)
</div>
<div class="product-specification fade tab-pane" id="specification">
@await Html.PartialAsync("_ProductSpecifications", Model.ProductSpecificationModel)
</div>*@
</div>
</div>
This will not render HTML code for product tag and specification tabs.