Your email looks comfortable, the desktop is readable, but one website makes you lean towards the screen. Start with that website. Changing the display for the whole computer would also change things that already work for you.
In desktop Chrome, open the site, open the three-dot menu and adjust Zoom with the plus or minus controls. Chrome also keeps site-specific zoom settings. The separate default under Appearance applies more broadly, so check which setting you are changing.
Judge a whole page, not one headline
Note the current percentage before experimenting. Increase it one step and read an ordinary paragraph, not just a large heading. Then check the navigation, a long link and any buttons near the bottom of the page.
A wider-looking paragraph may wrap onto more lines, and a menu may collapse into a button. The useful question is whether you can still find and operate the controls, rather than whether the layout stays identical.
Compare another familiar website in a second tab. If only the troublesome site has changed, the adjustment is doing what you intended. If browser menus and other applications are also uncomfortable, a wider display or accessibility adjustment may be worth considering separately.
Keep a route back
If the result is awkward, return to the percentage you wrote down. Chrome’s Settings also lets you remove an individual site’s saved zoom under Privacy and security, Site Settings, Additional content settings, Zoom levels.
Revisit the site afterwards and check both reading and navigation. A useful setting should make the next visit easier too. When recording a website problem, include the browser and zoom percentage; otherwise another person may never see the layout that caused the difficulty.