If you don’t mind editing the code. To remove SALE from the Collection page; go to the Snippets folder and open the product-card.liquid file. Near the end of the code, comment out the line that displays the Sale label:
{%- if product_card_product.available == false -%}
{{ 'products.product.sold_out' | t }}
{%- elsif product_card_product.compare_at_price > product_card_product.price and product_card_product.available -%}
{% comment %}
{{ 'products.product.on_sale' | t }}
{% endcomment %}
{%- endif -%}
For the individual product page: open price.liquid in the Snippets folder. At the end of the code, comment out the line that displays the Sale label:
{%- if show_badges -%}
{% comment %}
{{ 'products.product.on_sale' | t }}
{% endcomment %}
{{ 'products.product.sold_out' | t }}
{%- endif -%}