Hello @BINOD rajak,
Please check now. We have implemented global changes in our XStore Core plugin files, and these changes will be included in the next theme update.
Frontend result: https://gyazo.com/74d5ef3551c7cb4d41e84943b8141fc3 (simple on-sale), https://gyazo.com/f95fea88617db28844716154da43bfb3 (variable on-sale), https://gyazo.com/07a45e580c3c70c93c95946771c529b5 (variable regular), https://gyazo.com/689ae1465535280d616245939f0b9090 (simple regular)
Best regards,
Jack Richardson
The 8Theme’s Team