Stock splits are auto-adjusted on Trendlyne if you have the ‘Auto Adjust future Splits’ option enabled (marked by a blue tick) when adding your portfolio account, as shown below.

To verify if this option is active, go to your portfolio page and look for the setting, as shown below. If it is not checked, you can edit it from the 'Edit Accounts' page.

‘Submit’ your portfolio with this option checked, as shown below, to auto-adjust bonuses and splits. 

For portfolios imported via Excel, bonuses and splits are not auto-adjusted. Mergers and demergers require manual adjustment, as they are not automatically processed.