CCleaner Free v5.15.5513 (64-bit) has two columns in "Options > Cookies". The left-hand column header is "Cookies on Computer", and the right-hand column header is "Cookies to Keep".
According to PCMag's "Flash Cookie Cop", "Cookies on Computer" are "Disabled", and "Cookies to Keep" are "Enabled".
Does this mean that collecting a large number of "Cookies on Computer" will *not* cause any problems, because they are not "Enabled" until manually transferred to "Cookies to Keep"?
Hi welcome and answer to come, but first: I removed your email address. Never post your email like that, it draws spammers and scammers to both yourself and this website like a dog to a bone.
Now to the answer for your question. No, your understanding is not correct.
All cookies are initially listed in the "cookies on computer" column (herein COC) and the "Cookies to Keep" (herein CTK) should be empty, or at least contain very few entries, if you ran "intelligent cookie scan" in ccleaner.
When you run ccleaner, with the cookies sections of the browsers checked off, any cookie which is on the computer, and thusly listed in COC, will be removed from the PC.
If there are sites you wish to have your computer remember your login and/or site preferences you find it in COC and double click the listing; this will move it to CTK. Any cookie that is listed in CTK will not be removed when ccleaner runs cookie cleaning(s).
If you ran "intelligent cookie scan" look through the CTK column and double click any names you DO NOT want the PC to remember login/site-preferences for; this will move them back to COC and allow them to be removed.